Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o resultado com Marina Erakovic como oponente?
 ###Tabelas: CREATE TABLE percentage_pole_positions (percentage_pole_positions_id AUTO_INCREMENT PRIMARY KEY, Driver VARCHAR, Seasons VARCHAR, Entries INT, Poles INT, Percentage VARCHAR) CREATE TABLE polling (polling_id AUTO_INCREMENT PRIMARY KEY, Party VARCHAR, Results 2004 VARCHAR, CSA 5/28/09 VARCHAR, Ifop 5/30/09 VARCHAR, Ipsos 5/30/09 VARCHAR, BVA 6/1/09 VARCHAR, TNS-Sofres 6/2/09 VARCHAR, OpinionWay 6/3/09 VARCHAR, Ipsos 6/3/09 VARCHAR, TNS-Sofres 6/4/09 VARCHAR, CSA 6/4/09 VARCHAR, Ifop 6/4/09 VARCHAR) CREATE TABLE singles:_7_3–4 (singles:_7_3–4_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE democrats (democrats_id AUTO_INCREMENT PRIMARY KEY, Candidate VARCHAR, Total Receipts INT, Loans Received INT, Receipts w/o Loans INT, Money Spent INT, Cash On Hand INT, Total Debt VARCHAR, Cash on Hand Minus Debt INT) CREATE TABLE appearances__&__goals (appearances__&__goals_id AUTO_INCREMENT PRIMARY KEY, Squad No. INT, Name VARCHAR, Position VARCHAR, League Apps VARCHAR, League Goals INT, FA Cup Apps VARCHAR, FA Cup Goals INT, League Cup Apps VARCHAR, League Cup Goals INT, FLT Apps VARCHAR, FLT Goals INT, Total Apps VARCHAR, Total Goals INT)  
SELECT Outcome FROM singles:_7_3–4 WHERE Opponent = marina erakovic